https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67116
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Cezary Śliwa from comment #6)
> Created attachment 36131 [details]
> config.log
>
> libstdc++v3 config.log
This shows:
CXX=' x86_64-w64-mingw32-c++ -L/mingw64/x86_64-w64-mingw32/lib
-L/mingw64/mingw/lib -isystem /mingw64/x86_64-w64-mingw32/include -isystem
/mingw64/mingw/include '
CXXCPP=' x86_64-w64-mingw32-c++ -L/mingw64/x86_64-w64-mingw32/lib
-L/mingw64/mingw/lib -isystem /mingw64/x86_64-w64-mingw32/include -isystem
/mingw64/mingw/include -E'
That means you're building libstdc++ with the wrong compiler.
